S07.10-0053-79
Block diagram |
B2/6 | Left hot film mass air flow sensor | N93 | Central gateway (CGW) | |
B2/7 | Right hot film mass air flow sensor | Y76 | Fuel injectors | |
B4/6 | High-pressure fuel pressure sensor | CAN E | Chassis CAN | |
B11/4 | Coolant temperature sensor | CAN V | Vehicle CAN | |
B37/4 | Accelerator pedal module | A | Mercedes-Benz | |
B70 | Crankshaft Hall sensor | B | Nissan | |
N3/28 | CDI control unit | C | Default | |
N30/4 | Electronic Stability Program (ESP) control unit | D | Optional |
Function requirements for smooth running control, general points
Circuit 87M (Engine management ON)
Engine running.
Smooth running control, general points
The smooth running control reduces any rough running in the rpm range from approx. 750 to approx. 2,600 rpm.
For smooth running control, the CDI control unit (N3/28) reads in the following signals:
Engine load, left hot film mass air flow sensor (B2/6) and right hot film mass air flow sensor (B2/7)
High pressure fuel pressure sensor (B4/6)
Coolant temperature sensor (B11/4)
Accelerator pedal position, accelerator pedal module (B37/4)
Engine speed, Hall sensor crankshaft (B70)
Wheel speed signal, Electronic Stability Program (ESP) control unit (N30/4)
Function sequence for smooth running control
The function sequence is described in the following steps:
Function sequence for combustion misfire detection
Function sequence for sensor adaptation
Function sequence for combustion misfire detection
Here the CDI control unit reads in the signal from the crankshaft Hall sensor and evaluates its regularity. If lack of uniformity occurs with the signal of the crankshaft Hall sensor, the CDI control unit corrects the fuel pressure in the rail via the quantity control valve (Y94) and the injection duration via actuation of the fuel injectors (Y76).
The fuel pressure in the rail and the injection period of the fuel injectors produces the injection quantity.
Function sequence for sensor adaptation
The tolerance range for smooth running analysis is reduced after successful adaptation of the crankshaft Hall sensor.
In this way, the smooth running analysis can be adapted to the specific smooth running characteristics of the engine.
In overrun mode (accelerator pedal not pressed), during which there is uniform smooth operation, the CDI control unit stores the engine's smooth running properties. These are required as a comparison parameter for misfire detection.
The tolerance range for smooth running analysis is preset in the CDI control unit and can be adapted using Xentry Diagnostics if necessary.